The International Union of Bricklayers and Allied Craftworkers (BAC) is a labor union in the United States and Canada which represents bricklayers, restoration specialists, pointers/cleaners/caulkers, stonemasons, marble masons, cement masons, plasterers, tile setters, terrazzo mechanics, and tile, marble and terrazzo finishers.

[3] BAC President Harry Bates played a major role in the merger of AFL and CIO in 1955,[4] serving as Chair of the Unity Committee.

During his tenure the International and its affiliates have focused on creating coalitions with management partners and community groups to expand work prospects for BAC members and signatory contractors.

Some of those initiatives include gaining preeminence in green building, strengthening members’ benefits through job-creating capital strategies, and developing customized education and training programs for design professionals, signatory contractors and craftworkers.

BAC's Executive board is elected every five years by the delegates to the International Union's Convention.